Attachment for drill-grinding machines



(No Model.)

J. H. AGESEN. ATTACHMENT FOR DRILL GRINDING MACHINES. No. 579,215 Patented Mar 23,1897.

NI'TIED STaTns PATENT @rrren.

JOHN H. AGESEN, OF IIIGGANUM, CONNECTICUT.

ATTACHMENT FOR DRILL-GRENDING MACHINES.

SPECIFICATION forming part of Letters Patent No. 579,21 5, dated March 23, 1897. Application filed May 6, 1896. Serial No. 590,455. (No model.)

To all whom it may concern.-

Be it known that I, JOHN II. AGESEN, a citizen of the United States of America, residing at Higganum, in the county of Middlesex and State of Connecticut, have invented a certain new and useful Improvement in Attachments for Drill-Grindin g Machines, of whichthe following is a description, reference being had to the accompanying drawings, wherein- Figure 1 is a top view of the drill-bed and its immediate appurtenances. Fig. 2 is a side View of the drill-bed and its immediate appurtenances. Fig. 3 is a view of the drillbed in cross-section on the plane mos, looking in the direction indicated by the overlying arrow. Fig. 4 is a View of the drill-bed in cross-section on the plane indicated by the line :2 3 looking in the direction indicated by the overlying arrow. Fig. 5 is a front view of the support for the drill-bed.

The object of the improvement is the production of a mechanism, device, or apparatus for use in grinding the bevels at the point of a machine-drill.

In the accompanying drawings, the letter a denotes the drill-bed, which, as shown in Fig. 3, is substantially a V-shaped trough to receive and to support a drill while the bevels are being ground at the point thereof.

The letter Z) denotes an adjustable end-stop for what may be called the rear end of the drill. It is adjustable longitudinally of the drill-bed and held fixed atany desired adjustment by the bolt and nut c c.

The letter cl denotes a set-screw for holding the drill down upon the drill-bed while it is undergoing the grinding operation. This setscrew is carried in the arm (1, which slides or may slide on the rod 01 being supported from the drill-bed by the uprights d and (1 and by means of this arrangement just described the set-screw cl is adapted for adjustment longitudinally of the drill-bed.

The letter 6 denotes an adjustable gagestop for regulating the adjustment of the drill in the drill-bed rotarily. As shown, it is attached to the upright 6, having nearly vertical play in the upright d and pressed upward by the spring f.

The letter g denotes a set screw for holding the upright c, and consequently the gage-stop c, at any desired point of its permissible adjustment. It is the object and purpose of this adjustable gage-stop to enable the operator to grind the bevels at the point of the drill at accurately corresponding angles. The drill having been fastened in its bed and one of these bevels properly ground, the adj ustable stop is broughtagainst a shoulder of a flute of the drill and there fastened by means of the set-screw g. Then the drill is given a half -rotation, bringing the opposite fluteshoulder against the stop 6. The drill is again fastened to the bed by the set-screw cl and the other bevel is ground, and by reason of this action the two bevels are ground at accu rately corresponding angles. The up-anddown reciprocatory movement of the gagestop c is more nearly vertical than is the surface a within the drill-bed, wherefore it results that if the gage-stop be moved downward sufficiently it no longer projects from such surface a, and it is a result of this construction and operation that the gage-stop is made useful with drills of very small diameter as well as larger ones. Now as to the support for this attachment, the letter h denotes a base having adjustable movement'laterally in front of and across the face of the grindingwheel. From it rises the socket h. The letter denotes a post adj ustably secured in said socket, so that it may have vertical adjustment. This post carries the sleeve 7t, through which runs the shaft Z, having free rotary movement in such sleeve. The shaft Z carries a fork m, which in turn carries the upright shaft n, having free rotary movement in this fork. The drillbed is attached. as a whole to the upright shaft 02 by means of the socket o, and it results from this construction just described that the drill-bed and its appurtenances are hung and supported on what may well be called a universal joint.

I claim as my improvement- 1. In combination, the drill-bed a, the setscrew cl adapted for adjustment longitudinally of the drill-bed, the movable spring gagestop e, and the set-screw g, all substantially as described and for the purposes set forth.

2. In combination, the drill-bed a, the adjustable end-stop b, the set-screw cl adapted for adjustment longitudinally of the drillsurface a, all substantially as described and bed, the movable gage-stop e, and the setfor the purposes set forthv screw 9, all substantially as described and v T for the purposes set forth. JOHN AGESEL 5 3. The drill-bed 61, having the surface a, in Witnesses:

combination with the adjustable gage-stop e GEORGE I1. ATKINS, adapted to move in a line at an angle to said DAVID C. CLARK. 

